What do slack adjusters link in a brake system?

Slack adjusters play a crucial role in the operation of a brake system, particularly in vehicles equipped with air brakes, such as trucks and buses. They link the push rod to the 'S' cam brake shaft, facilitating the engagement and disengagement of the brakes when the driver applies or releases the brake pedal.

When the driver presses the brake pedal, it activates the push rod, which in turn rotates the 'S' cam. This rotation of the 'S' cam causes the brake shoes to press against the brake drum, thereby creating the necessary friction to slow down or stop the vehicle. The slack adjuster maintains the correct distance between the push rod and the 'S' cam, allowing the brake system to operate efficiently and ensuring that adjustments for wear and tear of the brake components can be made. If the slack adjuster were not functioning properly, it could lead to insufficient braking force, posing safety risks during operation.

This understanding of the relationship between the push rod and the 'S' cam, facilitated by the slack adjuster, is vital for anyone involved in vehicle inspection or maintenance, ensuring that brake systems remain effective and safe.